witness: lock order reversal: 1st 0xfffffd806619f918 inode (&ip->i_lock) 2nd 0xfffffd807b5e5068 fdlock (&newfdp->fd_fd.fd_lock) lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:879 #1 rw_enter+0xd1 sys/kern/kern_rwlock.c:247 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_closefile+0x119 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_closefile+0x119 vn_close sys/kern/vfs_vnops.c:288 [inline] #4 vn_closefile+0x119 sys/kern/vfs_vnops.c:587 #5 fdrop+0xc9 sys/kern/kern_descrip.c:1273 #6 closef+0x11d sys/kern/kern_descrip.c:1257 #7 finishdup+0x2b6 sys/kern/kern_descrip.c:686 #8 dodup3+0x5c5 sys/kern/kern_descrip.c:377 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 lock order "&ip->i_lock"(rrwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at: #0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:879 #1 rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 #2 diskmapioctl+0x237 sys/dev/diskmap.c:106 #3 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #4 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #5 sys_ioctl+0x5b8 #6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #6 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #7 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd807b5e5068,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807b5e5068,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807b5e5058) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800023d9db60,1,ffff800020acec80) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa7e0d0,c0106477,ffff800023d9db60,1,fffffd807f7c65a0,ffff800020acec80) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067bb4ef0,c0106477,ffff800023d9db60,ffff800020acec80) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020acec80,ffff800023d9dc78,ffff800023d9dce0) at sys_ioctl+0x5b8 syscall(ffff800023d9dd50) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023d9dd50) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,5e15fdc2010) at Xsyscall+0x128 end of kernel end trace frame: 0x5e39fdd69e0, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800023d9d720 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80002254a000 rax 0xffff800000a7e5c0 r8 0xffffffff8207c1f5 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0xf10662109c81c189 r12 0xfffffd80029b7c00 r13 0 r14 0xffffffff825fad40 w_lodata+0x36450 r15 0xffffffff82618dd0 w_lodata+0x544e0 rip 0xffffffff810d9878 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023d9d710 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=331673 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020acf3e8,0xffff800020acea18 process=0xffff800020add500 user=0xffff800023d98000, vmspace=0xfffffd807f00b2e0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 4925 191364 96077 0 2 0 syz-executor.0 * 4925 331673 96077 0 7 0x4000000 syz-executor.0 4925 398661 96077 0 2 0x4000000 syz-executor.0 4925 93953 96077 0 3 0x4000080 fsleep syz-executor.0 96077 276991 11102 0 3 0x82 nanosleep syz-executor.0 9714 488547 1 0 3 0x100083 ttyin getty 24730 480322 0 0 3 0x14200 bored sosplice 11102 198806 11891 0 3 0x82 thrsleep syz-fuzzer 11102 245996 11891 0 3 0x4000082 nanosleep syz-fuzzer 11102 201464 11891 0 3 0x4000082 thrsleep syz-fuzzer 11102 355625 11891 0 3 0x4000082 thrsleep syz-fuzzer 11102 126990 11891 0 2 0x4000002 syz-fuzzer 11102 263668 11891 0 3 0x4000082 thrsleep syz-fuzzer 11102 60793 11891 0 3 0x4000082 thrsleep syz-fuzzer 11102 138676 11891 0 7 0x4000002 syz-fuzzer 11102 149677 11891 0 3 0x4000082 thrsleep syz-fuzzer 11102 69204 11891 0 3 0x4000082 kqread syz-fuzzer 11891 403937 34824 0 3 0x10008a pause ksh 34824 320033 29264 0 3 0x92 select sshd 29264 52203 1 0 3 0x80 select sshd 59373 396381 39174 74 3 0x100092 bpf pflogd 39174 467296 1 0 3 0x80 netio pflogd 90951 385068 2958 73 3 0x100090 kqread syslogd 2958 316379 1 0 3 0x100082 netio syslogd 9049 155852 1 77 3 0x100090 poll dhclient 91667 218978 1 0 3 0x80 poll dhclient 40631 311331 0 0 2 0x14200 zerothread 74914 430449 0 0 3 0x14200 aiodoned aiodoned 35764 108514 0 0 3 0x14200 syncer update 82770 155776 0 0 3 0x14200 cleaner cleaner 17068 147849 0 0 3 0x14200 reaper reaper 67253 441763 0 0 3 0x14200 pgdaemon pagedaemon 74049 325868 0 0 3 0x14200 bored crynlk 41268 455784 0 0 3 0x14200 bored crypto 13953 10562 0 0 3 0x40014200 acpi0 acpi0 71407 480968 0 0 3 0x40014200 idle1 82375 87751 0 0 3 0x14200 bored softnet 22160 28920 0 0 3 0x14200 bored systqmp 44297 302614 0 0 3 0x14200 bored systq 61919 151889 0 0 3 0x40014200 bored softclock 26579 447117 0 0 3 0x40014200 idle0 55350 484182 0 0 3 0x14200 bored smr 1 191249 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 4925 (syz-executor.0) thread 0xffff800020acec80 (331673) exclusive rrwlock inode r = 0 (0xfffffd806619f918) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 spec_open+0x431 sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #7 vn_open+0x495 sys/kern/vfs_vnops.c:174 #8 diskmapioctl+0x18e sys/dev/diskmap.c:91 #9 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #10 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #11 sys_ioctl+0x5b8 #12 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #13 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8264be40) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x38f sys/kern/sched_bsd.c:441 #3 sleep_finish+0x113 sys/kern/kern_synch.c:373 #4 rw_enter+0x366 sys/kern/kern_rwlock.c:282 #5 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #6 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #7 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #8 spec_open+0x431 sys/kern/spec_vnops.c:159 #9 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #10 vn_open+0x495 sys/kern/vfs_vnops.c:174 #11 diskmapioctl+0x18e sys/dev/diskmap.c:91 #12 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #13 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #14 sys_ioctl+0x5b8 #15 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #15 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #16 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9644 6484K 15066K 78643K 84243 0 0 pcb 13 8K 8K 78643K 4020 0 0 rtable 93 12K 13K 78643K 10052 0 0 ifaddr 89 27K 35K 78643K 3821 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 2868 0 0 iov 0 0K 32K 78643K 3020 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1201 75K 77K 78643K 27583 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 402 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 3092 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 4 9K 25K 78643K 33206 0 0 sigio 0 0K 0K 78643K 348 0 0 proc 54 51K 83K 78643K 7054 0 0 subproc 16 1K 2K 78643K 1694 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 2604 0 0 in_multi 22 1K 2K 78643K 1927 0 0 ether_multi 1 0K 0K 78643K 111 0 0 mrt 1 0K 0K 78643K 93 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 156 689K 689K 78643K 156 0 0 exec 0 0K 1K 78643K 3716 0 0 pfkey data 0 0K 4K 78643K 15 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 130 15K 32K 78643K 104895 0 0 UVM aobj 130 5K 5K 78643K 148 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 3639 0 0 NDP 23 0K 1K 78643K 1151 0 0 temp 233 3556K 4197K 78643K 427625 0 0 kqueue 0 0K 0K 78643K 244 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 212 0 208 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1152 0 1150 1 0 1 1 0 8 0 rtentry 112 1133 0 1100 4 2 2 2 0 8 0 unpcb 120 9351 0 9341 2 1 1 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 9034 0 9034 1 1 0 1 0 8 0 tcpcb 544 5848 0 5844 2 1 1 2 0 8 0 inpcb 280 17211 0 17198 28 26 2 2 0 8 1 rttmr 72 16 0 16 15 15 0 1 0 8 0 ip6q 72 7 0 7 4 4 0 1 0 8 0 ip6af 48 14 0 14 4 4 0 1 0 8 0 nd6 48 290 0 287 1 0 1 1 0 8 0 pkpcb 40 125 0 125 44 44 0 1 0 8 0 swfcl 56 12 0 0 1 0 1 1 0 8 0 ppxss 1128 722 0 722 79 78 1 1 0 8 1 pffrag 232 60 0 60 31 31 0 1 0 482 0 pffrnode 88 60 0 60 31 31 0 1 0 8 0 pffrent 40 157 0 157 33 33 0 1 0 8 0 pfosfp 40 846 0 846 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 21 0 21 0 8 0 pfstitem 24 820 0 786 1 0 1 1 0 8 0 pfstkey 112 820 0 786 4 2 2 2 0 8 0 pfstate 328 820 0 786 13 9 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4699 0 4549 30 17 13 14 0 8 1 art_table 32 4700 0 4549 2 0 2 2 0 8 0 art_node 16 1118 0 1088 1 0 1 1 0 8 0 sysvmsgpl 40 6004 0 5992 3 2 1 1 0 8 0 semapl 112 3090 0 3080 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 50288 0 48739 53 2 51 51 0 8 0 ffsino 272 50288 0 48739 106 2 104 104 0 8 0 nchpl 144 94974 0 93344 62 0 62 62 0 8 0 uvmvnodes 72 9458 0 0 172 0 172 172 0 8 0 vnodes 200 9458 0 0 498 0 498 498 0 8 0 namei 1024 302880 0 302880 5 4 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 61 0 61 37 37 0 1 0 8 0 scxspl 192 276787 0 276787 96 93 3 7 0 8 3 plimitpl 152 2772 0 2765 1 0 1 1 0 8 0 sigapl 432 33127 0 33113 6 4 2 3 0 8 0 futexpl 56 397304 0 397303 4 3 1 1 0 8 0 knotepl 112 6178 0 6165 1 0 1 1 0 8 0 kqueuepl 104 6076 0 6074 1 0 1 1 0 8 0 pipepl 112 16772 0 16759 29 28 1 2 0 8 0 fdescpl 488 33128 0 33113 3 0 3 3 0 8 0 filepl 152 178476 0 178396 46 41 5 7 0 8 1 lockfpl 104 9426 0 9426 8 7 1 1 0 8 1 lockfspl 48 3165 0 3165 8 7 1 1 0 8 1 sessionpl 112 123 0 113 1 0 1 1 0 8 0 pgrppl 48 443 0 433 1 0 1 1 0 8 0 ucredpl 96 32670 0 32659 1 0 1 1 0 8 0 zombiepl 144 33123 0 33123 4 3 1 1 0 8 1 processpl 896 33154 0 33123 7 3 4 5 0 8 0 procpl 632 99172 0 99129 6 1 5 5 0 8 0 srpgc 64 210 0 210 91 90 1 1 0 8 1 sosppl 128 379 0 379 86 85 1 1 0 8 1 sockpl 384 28134 0 28115 34 31 3 5 0 8 1 mcl64k 65536 708 0 0 87 83 4 66 0 8 0 mcl16k 16384 36 0 0 5 2 3 3 0 8 0 mcl12k 12288 82 0 0 3 1 2 2 0 8 0 mcl9k 9216 81 0 0 4 2 2 2 0 8 0 mcl8k 8192 41 0 0 6 3 3 3 0 8 0 mcl4k 4096 41 0 0 4 1 3 3 0 8 0 mcl2k2 2112 16 0 0 2 0 2 2 0 8 0 mcl2k 2048 249 0 0 22 14 8 22 0 8 0 mtagpl 80 228 0 0 1 0 1 1 0 8 0 mbufpl 256 1748 0 0 44 13 31 37 0 8 0 bufpl 256 79916 0 70458 592 0 592 592 0 8 0 anonpl 16 2932494 0 2919510 601 532 69 70 0 124 12 amapchunkpl 152 192567 0 192457 168 162 6 19 0 158 0 amappl16 192 161340 0 160623 736 690 46 50 0 8 8 amappl15 184 5947 0 5947 15 15 0 1 0 8 0 amappl14 176 6487 0 6477 1 0 1 1 0 8 0 amappl13 168 5147 0 5146 1 0 1 1 0 8 0 amappl12 160 4551 0 4549 3 2 1 1 0 8 0 amappl11 152 5125 0 5110 1 0 1 1 0 8 0 amappl10 144 4213 0 4210 1 0 1 1 0 8 0 amappl9 136 6185 0 6183 1 0 1 1 0 8 0 amappl8 128 5600 0 5538 3 0 3 3 0 8 0 amappl7 120 4351 0 4343 1 0 1 1 0 8 0 amappl6 112 4860 0 4842 1 0 1 1 0 8 0 amappl5 104 5496 0 5483 1 0 1 1 0 8 0 amappl4 96 31004 0 30962 7 5 2 2 0 8 0 amappl3 88 8914 0 8903 1 0 1 1 0 8 0 amappl2 80 264405 0 264336 3 1 2 3 0 8 0 amappl1 72 714204 0 713765 26 16 10 20 0 8 0 amappl 80 101083 0 101046 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 147 0 18 3 0 3 3 0 8 0 uaddrrnd 24 33128 0 33113 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 33128 0 33113 1 0 1 1 0 8 0 vmmpekpl 168 241610 0 241582 2 0 2 2 0 8 0 vmmpepl 168 3994073 0 3992228 1083 984 99 117 0 357 5 vmsppl 368 33127 0 33113 2 0 2 2 0 8 0 pdppl 4096 66263 0 66226 7 1 6 6 0 8 0 pvpl 32 7609196 0 7592981 1174 1004 170 173 0 265 33 pmappl 232 33127 0 33113 7 6 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 920 0 144 24 1 23 23 0 8 0